How does PDF SignCheck verify a PDF digital signature?

PDF SignCheck cryptographically validates the digital signatures embedded in PDF documents. It checks that the document has not been tampered with after signing, verifies the signer's certificate chain against trusted root Certificate Authorities (CAs), and outputs a stamped PDF with a "Verified ✓" badge — similar to clicking "Trust this certificate" in Adobe Acrobat.

Is my PDF document stored or saved during digital signature verification?

No. Your file is processed entirely in memory on the server. It is never written to disk, never stored in any database, and is discarded immediately after the verified PDF is returned to your browser. We take privacy seriously — your documents remain yours.

What types of PDF digital signatures and certificates are supported?

PDF SignCheck supports PDFs that contain PKCS#7 / CMS digital signatures — the standard used by government portals, official certificate authorities, and digital signing platforms. This includes documents from DigiLocker, e-District, MCA, UIDAI, and similar government services worldwide.

Why does Adobe Acrobat Reader display a PDF signature as "Not Verified"?

Adobe Acrobat only trusts certificates from its own Adobe Approved Trust List (AATL). Many government and institutional signers are not on that list. Our tool auto-trusts the signer's certificate after cryptographic verification — exactly what Adobe asks you to do manually when you click "Trust this certificate." The downloaded verified PDF includes a visual stamp so it's clear the signature has been validated.

Is the online PDF signature verification process cryptographically secure?

Yes. We perform full PKCS#7 signature verification: we extract the signed hash from the signature, independently compute the hash of the document's byte ranges, and compare them. We also validate the certificate chain up to a trusted root CA from the Mozilla CA trust store. This is the same process that Adobe Acrobat and other professional PDF tools use.

Are there daily or rate limits for PDF cryptographic verification?

To prevent abuse, we rate-limit to 10 requests per minute per IP address. The maximum file size is 50 MB. These limits are sufficient for normal usage. If you need higher throughput for enterprise use, please contact us.

Which Indian government certificates and portals are supported?

PDF SignCheck fully supports digital signature verification for official Indian government certificates. This includes UIDAI Aadhaar Cards, state e-District certificates (such as Caste, Income, Domicile, and Birth/Death certificates), DigiLocker-issued PDF documents, NFSA Ration Cards, Income Tax / PAN documents, and any official PDF signed via CCA India (Controller of Certifying Authorities) root credentials.

How do I resolve the "Signature Not Verified" or "Signature Not Checked" warning on Aadhaar or Caste certificates?

Simply upload your signed PDF to PDF SignCheck. Our system extracts the digital signature, cryptographically validates the hash integrity against trusted root certificates, and generates a stamped PDF. When you download this verified document, the signature will show as valid, making it suitable for direct submission.

How do I verify the digital signature on my ITR-V acknowledgement?

Download your ITR-V from incometax.gov.in and upload it to pdfsigncheck.com. The tool will extract the PKCS#7 signature block, verify the hash integrity, validate the NIC certificate chain, and generate a stamped PDF with a green Signature Valid checkmark.

What is the password for my ITR-V PDF?

The ITR-V password is your PAN in lowercase followed by your date of birth in DDMMYYYY format. For example, if your PAN is ABCDE1234F and DOB is 15 March 1990, the password is abcde1234f15031990.

Can I verify my e-PAN card digital signature on a mobile phone?

Yes. pdfsigncheck.com is a browser-based tool that works on any Android phone, iPhone, or tablet. Open the website in your mobile browser, upload the e-PAN PDF, and get a verified copy instantly — no app required.

Why does Adobe show "Signature Not Verified" on my Form 16?

Form 16 is signed using your employer's DSC (Digital Signature Certificate) issued under CCA India. Adobe Acrobat does not include Indian CAs in its trust list (AATL), so it displays a warning. The signature is cryptographically valid — use pdfsigncheck.com to verify and get a stamped copy.

Is a digitally signed ITR-V legally valid?

Yes. Under Section 140 of the Income Tax Act, 1961, and Section 5 of the IT Act, 2000, electronically filed and digitally signed ITRs carry the same legal validity as physically signed returns. They are accepted by all government departments, banks, and courts.

Income Tax & PAN

How to Verify Income Tax & PAN Card PDF Digital Signatures

Validate the digital signature on your ITR-V acknowledgement, e-PAN card, Form 16, Form 26AS, and other Income Tax department documents.

By Minhaj, Founder of PDF SignCheck·Last updated: June 2026

💰

Verify Your ITR or PAN Signature Instantly

Upload your Income Tax Return acknowledgement or e-PAN card PDF to verify the Income Tax department's digital signature cryptographically and download a stamped copy with a Signature Valid ✓ badge.

Daily Limit

Drag & drop PDF to verify signatures

PKCS#7, CAdES, PAdES, X.509 chain & LTV validation

.PDF/MAX 50MB

1. Which Income Tax Documents Are Digitally Signed?

The Income Tax Department of India issues several types of digitally signed PDF documents through its e-filing portal. These include:

ITR-V (Verification Form): The acknowledgement receipt generated after filing your Income Tax Return electronically. This is the most commonly verified document.
e-PAN Card: The electronic PAN card PDF issued by NSDL e-Governance or UTIITSL, containing your PAN number, name, photograph, and digital signature.
Form 16 / 16A: TDS certificates issued by employers and banks, digitally signed by the deductor using their DSC (Digital Signature Certificate).
Form 26AS: The Annual Tax Statement showing all taxes deposited against your PAN, digitally signed by the TDS Centralized Processing Cell.
Intimation Orders (143(1)): Assessment intimation orders sent by the Income Tax department after processing your return.
AIS (Annual Information Statement): The comprehensive financial information statement available on the e-filing portal.

All these documents carry digital signatures issued under the Controller of Certifying Authorities (CCA) of India framework, using the PKCS#7 / CMS standard defined in RFC 5652. For a technical overview of how PDF digital signatures work, see our complete verification guide.

2. Step-by-Step: Verify ITR/PAN Online with pdfsigncheck.com

Verifying Income Tax documents is straightforward with pdfsigncheck.com:

Download the original PDF: Log in to incometax.gov.inand download your ITR-V, Form 16, or e-PAN from the relevant section. Ensure you download the original — do not use “Print to PDF” as this strips the digital signature.
Upload to pdfsigncheck.com: Visit pdfsigncheck.com and drag your PDF into the upload zone. If the document is password-protected (some ITR-V files use PAN + DOB), enter the password when prompted.
Automatic signature extraction & verification:Our engine extracts the PKCS#7 signature block, computes an independent hash of the document's byte ranges, and validates the certificate chain against the Income Tax department's CA — all the way up to the CCA India root.
Download the verified copy: The output PDF contains a permanent “Signature Valid ✓” badge. This stamped copy displays a green checkmark on any device, browser, or PDF reader — perfect for submitting to banks, visa offices, or audit authorities.

3. Why pdfsigncheck.com is Essential for Mobile & Android Users

Tax season in India sees millions of taxpayers filing returns from their smartphones. The Income Tax e-filing portal itself has a mobile app, and most users download their ITR-V or e-PAN directly to their phone. However, verifying the digital signature on these documents from a mobile device is nearly impossible without pdfsigncheck.com:

No desktop Adobe Acrobat on mobile: The full-featured Adobe Acrobat with signature verification is a desktop-only application. The mobile app does not support certificate trust configuration or detailed signature validation.
Android/iOS PDF viewers skip signatures: Default PDF viewers on Android (Google Drive, Samsung My Files, Xiaomi Mi Reader) and iOS (Files, Books) do not display or validate digital signature panels at all.
Chartered Accountants need quick verification: CAs and tax professionals often review client documents on-the-go from their phones. pdfsigncheck.com allows instant browser-based verification without any app installation.
Bank and visa submissions: When applying for loans, credit cards, or visas, banks often require a PDF with a visible “Signature Valid” status. Our verified stamped copy satisfies this requirement instantly.

pdfsigncheck.com works in any mobile browser — Chrome, Safari, Firefox, Samsung Internet — on any device. Upload your tax PDF, get it verified, and download the stamped copy in under 10 seconds. Your file is processed entirely in-memory with zero server storage.

4. Certificate Authorities for Income Tax Documents

Income Tax and PAN-related documents are signed by different Certifying Authorities depending on the issuing body:

NSDL e-Governance Infrastructure Limited: Signs e-PAN cards and handles PAN-related infrastructure. Licensed CA under CCA India.
NIC (National Informatics Centre): Signs ITR-V acknowledgements, Form 26AS, and intimation orders. NIC operates one of the largest CA operations in India.
eMudhra: Used for DSCs issued to employers and deductors for signing Form 16/16A. One of the most widely used commercial CAs in India.
TDS CPC (Centralized Processing Cell): The TDS CPC at Vaishali, Ghaziabad processes and signs TDS-related certificates.

None of these CAs are on Adobe's AATL, which is why Adobe shows a “Signature Not Verified” warning. pdfsigncheck.com validates against the Mozilla CA trust store, correctly verifying these Indian government CAs. Learn more in our Adobe trust warning explainer.

5. ITR-V Password Format

Some ITR-V acknowledgement PDFs from the e-filing portal are password-protected. The standard password format is:

Password = PAN (lowercase) + Date of Birth (DDMMYYYY)Example: If your PAN is ABCDE1234F and DOB is 15 March 1990, the password is abcde1234f15031990.

When you upload a password-protected ITR-V to pdfsigncheck.com, the system will detect the encryption and prompt you for the password. After decryption, the signature is verified and a stamped copy is generated — all in-memory with zero storage.

6. Common Issues & Troubleshooting

⚠ ITR-V downloaded from old e-filing portalIf your ITR-V was filed on the old portal (before migration to incometax.gov.in in 2021), the signing certificate may have expired. The document integrity can still be verified, but the timestamp will show an older date.

⚠ Form 16 from employer shows “unknown signer”Form 16/16A is signed by your employer's DSC, not the Income Tax department. The signer CN will show the employer or CA name. This is expected — pdfsigncheck.com still validates the cryptographic integrity.

⚠ e-PAN downloaded from DigiLockere-PAN cards fetched through DigiLocker carry a DigiLocker-issued signature. See our DigiLocker verification guide for specific instructions.

7. Legal Validity of Digitally Signed Tax Documents

Digitally signed Income Tax documents are legally valid and admissible under:

IT Act 2000 — Section 5: Electronic signatures on tax documents carry the same legal standing as physical signatures.
Income Tax Act, 1961 — Section 140: Allows electronic filing and digital verification of income tax returns.
CBDT Notification No. 2/2015: Electronic verification of ITR through Aadhaar OTP, net banking, or DSC is legally valid.
IT Act 2000 — Section 65B: Electronically signed documents are admissible as evidence in Indian courts, provided the digital signature is verified.

For the full regulatory framework, refer to the Income Tax e-Filing Portal and the MeitY IT Act page.

8. Related Tools & Guides

Explore more verification guides and PDF tools from pdfsigncheck.com:

Verify Aadhaar & e-Aadhaar Signatures — Validate the UIDAI digital signature on your e-Aadhaar PDF.
Verify Income Certificate Signatures — Check digital signatures on e-District income certificates (different from ITR).
PDF Dark Mode Converter — Convert your verified tax documents to dark mode for comfortable reading.
PDF Reading Time Inserter — Add estimated reading time stamps to long tax documents and reports.
PDF Duplicate Page Remover — Remove duplicate pages from compiled tax document bundles.